We get asked this question very often, and there is no proper answer as it depends on a range of factors.
To begin with, it all comes down to you and your personal preferences; some people would have their windows cleaned every single week if they could or had the time to do it.
Others prefer to have them cleaned once or twice a year however that isn’t something we would recommend as we get lots of houses for a first clean that are badly stained from having dirt sat on a window for too long that has now eaten into the frames. When this happens, it means the only option is either restoration or in the worst-case scenario, a complete replacement.
The rule of thumb is four weekly keeps your windows and frames regularly clean. Whereas every eight weeks you will see them being noticeably dirty and as such cleaning them then will give you the most significant impact but still keep on top of it, so there isn’t a chance for anything to stain or cause any damage.
Areas with lots of overhanging or nearby trees we always suggest are done every four weeks because the sap, leaves and dust causes them to look dirty a lot quicker.